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A personal tragedy reopens old wounds for the Mullen family. Speaker Dreyer pushes for a change in leadership. Sheila testifies before Congress.
A shock to the financial system increases scrutiny on Mullen's commission. Valerie investigates Proteus. Roger must make a difficult choice.
A new threat creates further unrest across the nation. As he narrows in on the culprit, Mullen is faced with an agonizing decision.